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Clearly the blocky guys slot into the round guys and then are bolted in. Then the round guys rotate in something. What do the faces of the blocky ones look like?
They kind of seem like they'd fulfill the same purpose as brake shoes (positionable flat face, 4 of them) but are clearly not brake shoes. Unless they're for modern rod brakes or something mad.
What are these things I’ve found in my biek bits boxes in the garage and why do I want them?